//: Playground - noun: a place where people can play

import UIKit
import XCPlayground
import PlaygroundSupport

PlaygroundPage.current.needsIndefiniteExecution = true

var movie: String?;
var actor1: String?;
var actor2: String?;

var db = ["a1": "Abe", "a2": "Betty", "m1": "Ben Hur"]


func printEvent() {
  print( actor1 ?? "unknown", ":",
         movie ?? "unknown",":",
         actor2 ?? "unknown")
}

func apiCall(url: String, completion: @escaping (_ result: String) -> Void) {
  print("get apiCalled with url: " + url);
  DispatchQueue.main.asyncAfter(deadline: .now() + .seconds(1), execute: {
    // Put your code which should be executed with a delay here

    if let result = db[url] {
      completion(result);
    }
    else {
      completion("error");
    }
  })
}

func setActor1(result: String) {
  actor1 = result;
  apiCall(url: "m1", completion: setMovie)
}

func setMovie(result: String) {
  movie = result;
  apiCall(url: "a2", completion:  setActor2)
}

func setActor2(result: String) {
  actor2 = result;
  printEvent()
  PlaygroundPage.current.finishExecution()
}

apiCall(url: "a1", completion: setActor1)

print("After Setup");
printEvent()